Method of and apparatus for making concrete posts



Eco $7 1270 I E939 B. HANNA METHOD OF AND APPARATUS FOR MAKING CONCRETEPOSTS Filed Jan.,26. 1926 2 smmsm 1 Dec. 6, N2 7.

' mama D. a. HANNA METHOD OF AND APPARATUS FOR MAKING CONCRETE POSTSFiled Jan.26. 1925 Patented Dec. 6, 1927.

UNITED .sT-Ars oF IcE.

DAVID B. HANNA, OF CHICAGO, ILLINOIS.

METHOD OF AND APPARATUS FOR MAKING CONCRETE POSTS.

Application filed January 26, 1926. Serial No. 83,785.

to combine rammingor jolting with rotation and before entering into adetailed description I wish to point out,v as is well known in the art,that ramming or jolting concrete after it has been poured greatlyincreases the compactness or density of prod ucts. In posts used forlighting purposes it is, of course, often necessary to provide a racewayfor the electric wires which, in an ordinary molding operation,necessitates the use of a core.

, With the foregoing in mind it is an object of my invention to ram orjolt a mold having a core and subsequently to rotate it in order toforce the concrete centrifugally away from the core and thereby releasethe core so that it can be easily withdrawn. Ramming or jolting would,of course, tend to pack the concrete so tightly around the core that itcould not be easily removed if at all. lVith my process and apparatus 1rotate the mold immediately after the ramming or jolting operation whichwill still further increase the density of the concrete and at the sametime free the core.

More specific objects of the invention reside in the provision of anapparatus for jolting the mold in a substantially vertical position andthen subsequently rotating it without changing its position andthe pr0-vision of a supporting table in an apparatus for carrying this out whichcan be jolted at will or rotated at will.

The foregoing together with such other objects as may appear hereinafteror are incident to my invention I attain by means of a constructionwhich is illustrated in pre fer-red form in the accompanying drawings,wherein Fig. 1 is a side. elevation of my improved apparatus;

' Fig. 2 is an enlarged section on the line 2-2 of Fig. 1;

Fig. 3 is an enlarged elevationpartly in section similar to the showingof Fig. 1 but illustrating only the lower end of my apparatus, namelythe table; and: I FFig. 4 is a section on the line 44 of Referring tothe drawings it will be seen that the mold 5 is provided with a core6and that it stands upon the table indicated as a whole by the referencecharacter A. The mold can be secured in any desirable way to thesupporting shelf or ledge 7 of the table by means of the bolts 8.

The upper end of the post mold is positioned and guided by thesurrounding track 9 adapted to fit in the grooves of the rollers orwheels 9*. Two of these rollers are stationary or fixed to thevertically moving guide carriage 10 (see Fig. 2) while the third jroller is mounted near the outer end of the curved retaining arm 11which is adapted to be coupled to the curved retaining arm 12 by meansof the pin 13. When it is desired to insert or release a mold the pin 13is uncoupled and the arms .11 and 12 thrown back out of the way.

The'guide carriage 10 is mounted for up and down movement on the I-beams14 and is connected over the pulley wheel 15 to the counterweight 16 bymeans of the cable 17. It will therefore be seen that my apparatus canreadily take care of different heights of posts. The guide carriage 10can be clamped at any desired position by means of the bolts 18 and handoperated nuts19 as will be clearly seen upon inspection of Fig. 2.

The table comprises the framework 20 with shaft 21 for the joltingoperation and shaft 22 for the rotating operation, said shafts beingsubstantially vertically disposed and parallel to each other.Transversely of the first two shafts in the bottom of the framework Iprovide the operating shaft" 23 driven in any suitable manner as by abelt upon the pulley 24. The shaft 23 car ries a cam 25 between thecollars 26 and as this cam rotates it operates to lift the shaft 21 andthe table top 7 through the medium of apparatus now to be described. Thecam works upon a roller 27 the axis 28 of which extends outwardly oneach side through the bifurcated'bearing plate 29 and the lifting arms30. The plate rests upon the arms and the arms are pivoted to the frameat 3 1. The outer or free ends of the arms 30 are seated on thevertically movable spring supported sleeves 32 which are adapted toslide up and down on the stem or rod 33. The spring 34 below the sleeve32 rests upon another sleeve 35 which has threaded engagement with therod 33, as shown, so that upon rotation of the rod by means of the handWheel 36 it is possible to raise and lower the outer ends'of the arms30, the same being at all times cushioned by the springs 34:. In thisway thedistance that the cam lifts the table top 7 can be adjusted andthe force of the impact on the downward stroke regulated. v

The thrust bearing 37 rests upon the plate 29, above which is the doublecup shaped member 38 carrying on its upper face the lower end of thejolting shaft 21, the latter taking the shape of a hollow tube asindicated in Fig. 4. The parts 29, 37, 38, 21, and

'7 are held together in a vertical longitudinal nular ball bearings 47.

The hub 43 carries the gear 48 which is adaptedto mesh with the gear 49at the top of the rotating shaft 22. .Rotating motion is impartedthrough the same shaft 23 which raises and lowers the table top 7 bymeans of the gear 50 at the lower end of the shaft 22, gear 51 ontheshaft 23, sleeve 52 to which the latter is secured and clutch mechanism53. operated by the hand lever 54.;'

A summary of the operation is as follows:

A mold 5 with its core is secured 'to the table top 7 and guided at thetop by the clear the path of the cam 25. may then be thrown in and thetable top 7 by centrifugal action.

rollers 94. The shaft 23is rotated-and the table top 7 raised by the cam25 after which i it drops backtothe pad 44 and thereby jolts the mold.When the-jolting is completed the arms 30 may be sufliciently raised bymeans of the hand wheel 36 as described to The clutch 53 with the moldwhich it carriesrotateduntil the centrifugal force compacts the concreteoutwardly sutliciently'to free the core 6."

My improved method gives a product of unusual density and strengthand'one which although it has had the advantage of a'jolting operationstill has-within it a suitable raceway for wiring or piping necessaryfor lights.

I claim 1. The herein described method of making concrete posts whichcomprises compacting the concrete in a mold and around a core and thenrotating the mold at a speed suflicient to free the core from theconcrete 2. The herein descrlbed method of malting concrete posts whichcomprises moldirg around a core, vertically jolting the mold to. packthe concrete, and rotating the mold at a speed suflicient to free thecore from the concrete by centrifugal action.

3. The herein described method of making concrete posts which comprisesmolding around asubstantially vertical core, jolting in uprightposition, and rotating at a speed sufficient to free thecorc from theconcrete by centrifugal action. 1 1

4. An apparatus for making concrete posts comprising in combination, amold having a core, means for jolting the-mold to pack the concretereceived therein, and means for rotating the mold at a speed suflicientto effect separation of the packed concrete from the core due to theaction of centrifugal force.

An apparatus for making concrete posts comprising in combination, a moldhaving a core, means for supporting and jolting the mold in asubstantially vertical position whereby to firmly pack the concretetherein. and separate means for rotating the mold whereby to set up acentrifugal action suflicient'to free the core from the packed concrete.p

6. In concrete post making apparatus the combination of a mold, a tablefor supporting the mold, means for joltingthe table, and means operablesubsequently to the operation of said jolting means for rotating thetable. a

7. An apparatus for jolting and rotating a concrete post making moldcomprising in combination, a table, acamfor jolting it, means forrotating the cam, a gear drive for rotating the table, and a clutch forconnecting said gear drive to the means for rotating the cam.

8.- An apparatus for jolting and rotating a'concrete post making moldcomprising in combination, a table, a shaft for jolting it, ashaft forrotating it. a common shaft for actuating both of said first two shafts,means for establishing and disabling the jolting connection. and meansfor establishing and disabling the rotating connection.

9. Apparatus for'making concrete posts comprising in combination, amold, a table for supporting the mold in a. substantially verticalposition, means for jolting the table, means for rotating it, and meansguiding the upper end of the mold without interfering with the joltingand rotating operations.

10. An apparatus for making concrete posts comprising, in combination, amold,

means for jolting said mold in a substantially vertical direction, anannular member freely surrounding the upper end of said mold androtatabletherewlth, and a plurality of rollers ,operatively associatedwith said member for preventing its vertical displacement withoutinterfering with its rotative movement.

1 1. An apparatus for making I concrete posts comprising, incombination, a mold,

means for jolting said mold in a substantimovement, said member androllers lying ally vertical direction, an annular member insubstantially the same horzontal plane, freely surrounding the upper endof said and means for varying the elevation of said mold and rotatabletherewith, a plurality of plane. Y

rollers operatively associated with said In testimony whereof, I havehereunto member for preventing its vertical displace signed my name.ment Without interfering with its rotative DAVID B. HANNA.

